PayRoll application, embedded in Rails, borrowing from Use Case Driven Architecture and DCI

gistfile1.rb

module PayRoll
  class PayDayService < Service
    def initialize(date=Date.now, employees=datastore.find_all_employees)
      @date = date
      @employees = employees.each{|e| e.extend(Employee) }
    end

    def execute
      @employees.each do |e|
        if e.pay_date?(@date)
          pc = PayCheck.new(e.calculate_pay(@date))
          e.send_pay(pc)
        end
      end
    end
  end

  module PayableEmployee
    def pay_date?(date)
      # ...
    end

    def send_pay(pay_check)
      # ...
    end
  end
end

PayRoll::PayDayService.new(Employee.all).execute